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Leases - Narrative (Details) $ in Thousands |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jul. 01, 2020 USD ($) ft² item | May 31, 2022 USD ($) ft² period building | Mar. 31, 2023 USD ($) lease | Mar. 31, 2022 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2022 USD ($) | Jun. 19, 2020 USD ($)
Leases |  |  |  |  |  |  |
Number of operating leases | lease |  |  | 2 |  |  |  |
Operating lease, expense |  |  | $ 7,100 | $ 5,300 |  |  |
Finance Lease, Liability |  |  | 19,041 |  |  |  |
Finance lease liabilities- current |  |  | 1,857 |  |  | $ 3,000 |
Finance lease liabilities- noncurrent |  |  | 17,184 |  |  | 18,675 |
Aggregate rent, Initial term |  |  | 264,252 |  |  |  |
Operating lease ROU assets |  |  | 99,531 |  |  | $ 102,430 |
Operating Lease, Liability |  |  | 110,040 |  |  |  |
Research and development |  |  | 195,124 | 140,078 |  |  |
2024 |  |  | 18,465 |  |  |  |
MassBio |  |  |  |  |  |  |
Leases |  |  |  |  |  |  |
Finance lease cost |  |  | 400 | $ 400 |  |  |
Finance Lease, Liability |  |  |  |  |  |  | $ 41,400
Finance lease liabilities- current |  |  | 1,800 |  |  |  |
Finance lease liabilities- noncurrent |  |  | $ 17,200 |  |  |  |
Finance lease ROU asset |  |  |  |  |  |  | $ 41,400
Finance lease, term of contract |  |  |  |  |  |  | 12 years 6 months
Research and development |  |  |  |  | $ 41,400 |  |
Minimum |  |  |  |  |  |  |
Leases |  |  |  |  |  |  |
Operating lease, term of contract |  |  | 10 months 24 days |  |  |  |
Maximum |  |  |  |  |  |  |
Leases |  |  |  |  |  |  |
Operating lease, term of contract |  |  | 16 years 2 months 12 days |  |  |  |
Renewal term |  |  | 20 years |  |  |  |
Hopewell Campus |  |  |  |  |  |  |
Leases |  |  |  |  |  |  |
Operating lease, term of contract | 15 years |  |  |  |  |  |
Area of real estate property | ft² | 220,500 |  |  |  |  |  |
Renewal term | 10 years |  |  |  |  |  |
Number of renewable terms | item | 2 |  |  |  |  |  |
Lessee, Operating Lease, Existence of Option to Extend [true false] | true |  |  |  |  |  |
Aggregate rent, Initial term | $ 111,500 |  |  |  |  |  |
Percent of market rate | 95.00% |  |  |  |  |  |
Warren Premises |  |  |  |  |  |  |
Leases |  |  |  |  |  |  |
Operating lease, term of contract |  | 17 years |  |  |  |  |
Number of buildings leased | building |  | 2 |  |  |  |  |
Area of real estate property | ft² |  | 360,000 |  |  |  |  |
Renewal term |  | 5 years |  |  |  |  |
Number of renewable terms | period |  | 3 |  |  |  |  |
Lessee, Operating Lease, Existence of Option to Extend [true false] |  | true |  |  |  |  |
Aggregate rent, Initial term |  | $ 163,000 |  |  |  |  |
Operating lease ROU assets |  | 28,900 |  |  |  |  |
Operating Lease, Liability |  | $ 28,900 |  |  |  |  |
Base rent abatement period |  | 3 years |  |  |  |  |
Base rent abatement |  | $ 18,600 |  |  |  |  |
Aggregate rent net of base rate abatement, initial term |  | 144,400 |  |  |  |  |
Allowance for lease improvements |  | 36,200 |  |  |  |  |
Commitment to fund construction account |  | 3,600 |  |  |  |  |
Payment due from lessor at issuance of temporary certificate of occupancy |  | $ 5,000 |  |  |  |  |

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- Definition The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 912 -SubTopic 730 -Section 25 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=6472174&loc=d3e58812-109433 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 730 -SubTopic 10 -Section 50 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=6420194&loc=d3e21568-108373 + Details
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